amixer.c

alsa-utils-1.0.14编译声卡驱动所需要的一些文件源码

				sptr = ptr;
				if (!strncmp(ptr, "mute", 4) && snd_mixer_selem_has_playback_switch(elem)) {
					snd_mixer_selem_get_playback_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "mute", 1, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "off", 3) && snd_mixer_selem_has_playback_switch(elem)) {
					snd_mixer_selem_get_playback_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "off", 1, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "unmute", 6) && snd_mixer_selem_has_playback_switch(elem)) {
					snd_mixer_selem_get_playback_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "unmute", 0, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "on", 2) && snd_mixer_selem_has_playback_switch(elem)) {
					snd_mixer_selem_get_playback_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_playback_switch(elem, chn, get_bool_simple(&ptr, "on", 0, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "toggle", 6) && snd_mixer_selem_has_playback_switch(elem)) {
					if (firstchn || !snd_mixer_selem_has_playback_switch_joined(elem)) {
						snd_mixer_selem_get_playback_switch(elem, chn, &ival);
						if (snd_mixer_selem_set_playback_switch(elem, chn, (ival ? 1 : 0) ^ 1) >= 0)
							check_flag = 1;
					}
					simple_skip_word(&ptr, "toggle");
				} else if (isdigit(*ptr) || *ptr == '-' || *ptr == '+') {
					if (set_volume_simple(elem, chn, &ptr, 0) >= 0)
						check_flag = 1;
				} else if (simple_skip_word(&ptr, "cap") || simple_skip_word(&ptr, "rec") ||
					   simple_skip_word(&ptr, "nocap") || simple_skip_word(&ptr, "norec")) {
					/* nothing */
				} else {
					okflag &= ~1;
				}
			}
			if ((dir & 2) && snd_mixer_selem_has_capture_channel(elem, chn)) {
				if (sptr != NULL)
					ptr = sptr;
				sptr = ptr;
				if (!strncmp(ptr, "cap", 3) && snd_mixer_selem_has_capture_switch(elem)) {
					snd_mixer_selem_get_capture_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "cap", 0, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "rec", 3) && snd_mixer_selem_has_capture_switch(elem)) {
					snd_mixer_selem_get_capture_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "rec", 0, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "nocap", 5) && snd_mixer_selem_has_capture_switch(elem)) {
					snd_mixer_selem_get_capture_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "nocap", 1, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "norec", 5) && snd_mixer_selem_has_capture_switch(elem)) {
					snd_mixer_selem_get_capture_switch(elem, chn, &ival);
					if (snd_mixer_selem_set_capture_switch(elem, chn, get_bool_simple(&ptr, "norec", 1, ival)) >= 0)
						check_flag = 1;
				} else if (!strncmp(ptr, "toggle", 6) && snd_mixer_selem_has_capture_switch(elem)) {
					if (firstchn || !snd_mixer_selem_has_capture_switch_joined(elem)) {
						snd_mixer_selem_get_capture_switch(elem, chn, &ival);
						if (snd_mixer_selem_set_capture_switch(elem, chn, (ival ? 1 : 0) ^ 1) >= 0)
							check_flag = 1;
					}
					simple_skip_word(&ptr, "toggle");
				} else if (isdigit(*ptr) || *ptr == '-' || *ptr == '+') {
					if (set_volume_simple(elem, chn, &ptr, 1) >= 0)
						check_flag = 1;
				} else if (simple_skip_word(&ptr, "mute") || simple_skip_word(&ptr, "off") ||
					   simple_skip_word(&ptr, "unmute") || simple_skip_word(&ptr, "on")) {
					/* nothing */
				} else {
					okflag &= ~2;
				}
			}
			if (okflag == 0) {
				if (debugflag) {
					if (dir & 1)
						error("Unknown playback setup '%s'..", ptr);
					if (dir & 2)
						error("Unknown capture setup '%s'..", ptr);
				}
				if (! keep_handle) {
					snd_mixer_close(handle);
					handle = NULL;
				}
				return 0;
			}
			if (!multi)
				ptr = optr;
			firstchn = 0;
		}
	}
	if (!check_flag) {
		error("Invalid command!");
		if (! keep_handle) {
			snd_mixer_close(handle);
			handle = NULL;
		}
		return 1;
	}
      __skip_write:
	if (!quiet) {
		printf("Simple mixer control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
		show_selem(handle, sid, "  ", 1);
	}
	if (! keep_handle) {
		snd_mixer_close(handle);
		handle = NULL;
	}
	return 0;
}

static void events_info(snd_hctl_elem_t *helem)
{
	snd_ctl_elem_id_t *id;
	snd_ctl_elem_id_alloca(&id);
	snd_hctl_elem_get_id(helem, id);
	printf("event info: ");
	show_control_id(id);
	printf("\n");
}

static void events_value(snd_hctl_elem_t *helem)
{
	snd_ctl_elem_id_t *id;
	snd_ctl_elem_id_alloca(&id);
	snd_hctl_elem_get_id(helem, id);
	printf("event value: ");
	show_control_id(id);
	printf("\n");
}

static void events_remove(snd_hctl_elem_t *helem)
{
	snd_ctl_elem_id_t *id;
	snd_ctl_elem_id_alloca(&id);
	snd_hctl_elem_get_id(helem, id);
	printf("event remove: ");
	show_control_id(id);
	printf("\n");
}

int element_callback(snd_hctl_elem_t *elem, unsigned int mask)
{
	if (mask == SND_CTL_EVENT_MASK_REMOVE) {
		events_remove(elem);
		return 0;
	}
	if (mask & SND_CTL_EVENT_MASK_INFO) 
		events_info(elem);
	if (mask & SND_CTL_EVENT_MASK_VALUE) 
		events_value(elem);
	return 0;
}

static void events_add(snd_hctl_elem_t *helem)
{
	snd_ctl_elem_id_t *id;
	snd_ctl_elem_id_alloca(&id);
	snd_hctl_elem_get_id(helem, id);
	printf("event add: ");
	show_control_id(id);
	printf("\n");
	snd_hctl_elem_set_callback(helem, element_callback);
}

int ctl_callback(snd_hctl_t *ctl, unsigned int mask,
		 snd_hctl_elem_t *elem)
{
	if (mask & SND_CTL_EVENT_MASK_ADD)
		events_add(elem);
	return 0;
}

static int events(int argc ATTRIBUTE_UNUSED, char *argv[] ATTRIBUTE_UNUSED)
{
	snd_hctl_t *handle;
	snd_hctl_elem_t *helem;
	int err;

	if ((err = snd_hctl_open(&handle, card, 0)) < 0) {
		error("Control %s open error: %s\n", card, snd_strerror(err));
		return err;
	}
	snd_hctl_set_callback(handle, ctl_callback);
	if ((err = snd_hctl_load(handle)) < 0) {
		error("Control %s hbuild error: %s\n", card, snd_strerror(err));
		return err;
	}
	for (helem = snd_hctl_first_elem(handle); helem; helem = snd_hctl_elem_next(helem)) {
		snd_hctl_elem_set_callback(helem, element_callback);
	}
	printf("Ready to listen...\n");
	while (1) {
		int res = snd_hctl_wait(handle, -1);
		if (res >= 0) {
			printf("Poll ok: %i\n", res);
			res = snd_hctl_handle_events(handle);
			assert(res > 0);
		}
	}
	snd_hctl_close(handle);
	return 0;
}

static void sevents_value(snd_mixer_selem_id_t *sid)
{
	printf("event value: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
}

static void sevents_info(snd_mixer_selem_id_t *sid)
{
	printf("event info: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
}

static void sevents_remove(snd_mixer_selem_id_t *sid)
{
	printf("event remove: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
}

int melem_event(snd_mixer_elem_t *elem, unsigned int mask)
{
	snd_mixer_selem_id_t *sid;
	snd_mixer_selem_id_alloca(&sid);
	snd_mixer_selem_get_id(elem, sid);
	if (mask == SND_CTL_EVENT_MASK_REMOVE) {
		sevents_remove(sid);
		return 0;
	}
	if (mask & SND_CTL_EVENT_MASK_INFO) 
		sevents_info(sid);
	if (mask & SND_CTL_EVENT_MASK_VALUE) 
		sevents_value(sid);
	return 0;
}

static void sevents_add(snd_mixer_elem_t *elem)
{
	snd_mixer_selem_id_t *sid;
	snd_mixer_selem_id_alloca(&sid);
	snd_mixer_selem_get_id(elem, sid);
	printf("event add: '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
	snd_mixer_elem_set_callback(elem, melem_event);
}

int mixer_event(snd_mixer_t *mixer, unsigned int mask,
		snd_mixer_elem_t *elem)
{
	if (mask & SND_CTL_EVENT_MASK_ADD)
		sevents_add(elem);
	return 0;
}

static int sevents(int argc ATTRIBUTE_UNUSED, char *argv[] ATTRIBUTE_UNUSED)
{
	snd_mixer_t *handle;
	int err;

	if ((err = snd_mixer_open(&handle, 0)) < 0) {
		error("Mixer %s open error: %s", card, snd_strerror(err));
		return err;
	}
	if (smixer_level == 0 && (err = snd_mixer_attach(handle, card)) < 0) {
		error("Mixer attach %s error: %s", card, snd_strerror(err));
		snd_mixer_close(handle);
		return err;
	}
	if ((err = snd_mixer_selem_register(handle, smixer_level > 0 ? &smixer_options : NULL, NULL)) < 0) {
		error("Mixer register error: %s", snd_strerror(err));
		snd_mixer_close(handle);
		return err;
	}
	snd_mixer_set_callback(handle, mixer_event);
	err = snd_mixer_load(handle);
	if (err < 0) {
		error("Mixer %s load error: %s", card, snd_strerror(err));
		snd_mixer_close(handle);
		return err;
	}

	printf("Ready to listen...\n");
	while (1) {
		int res;
		res = snd_mixer_wait(handle, -1);
		if (res >= 0) {
			printf("Poll ok: %i\n", res);
			res = snd_mixer_handle_events(handle);
			assert(res >= 0);
		}
	}
	snd_mixer_close(handle);
	return 0;
}

/*
 * split a line into tokens
 * the content in the line buffer is modified
 */
static int split_line(char *buf, char **token, int max_token)
{
	char *dst;
	int n, esc, quote;

	for (n = 0; n < max_token; n++) {
		while (isspace(*buf))
			buf++;
		if (! *buf || *buf == '\n')
			return n;
		/* skip comments */
		if (*buf == '#' || *buf == '!')
			return n;
		esc = 0;
		quote = 0;
		token[n] = buf;
		for (dst = buf; *buf && *buf != '\n'; buf++) {
			if (esc)
				esc = 0;
			else if (isspace(*buf) && !quote) {
				buf++;
				break;
			} else if (*buf == '\\') {
				esc = 1;
				continue;
			} else if (*buf == '\'' || *buf == '"') {
				if (! quote) {
					quote = *buf;
					continue;
				} else if (*buf == quote) {
					quote = 0;
					continue;
				}
			}
			*dst++ = *buf;
		}
		*dst = 0;
	}
	return n;
}

#define MAX_ARGS	32

static int exec_stdin(void)
{
	int narg;
	char buf[256], *args[MAX_ARGS];
	int err = 0;

	/* quiet = 1; */
	ignore_error = 1;

	while (fgets(buf, sizeof(buf), stdin)) {
		narg = split_line(buf, args, MAX_ARGS);
		if (narg > 0) {
			if (!strcmp(args[0], "sset") || !strcmp(args[0], "set"))
				err = sset(narg - 1, args + 1, 0, 1);
			else if (!strcmp(args[0], "cset"))
				err = cset(narg - 1, args + 1, 0, 1);
			if (err < 0)
				return 1;
		}
	}
	return 0;
}


int main(int argc, char *argv[])
{
	int morehelp, level = 0;
	int read_stdin = 0;
	static struct option long_option[] =
	{
		{"help", 0, NULL, 'h'},
		{"card", 1, NULL, 'c'},
		{"device", 1, NULL, 'D'},
		{"quiet", 0, NULL, 'q'},
		{"inactive", 0, NULL, 'i'},
		{"debug", 0, NULL, 'd'},
		{"nocheck", 0, NULL, 'n'},
		{"version", 0, NULL, 'v'},
		{"abstract", 1, NULL, 'a'},
		{"stdin", 0, NULL, 's'},
		{NULL, 0, NULL, 0},
	};

	morehelp = 0;
	while (1) {
		int c;

		if ((c = getopt_long(argc, argv, "hc:D:qidnva:s", long_option, NULL)) < 0)
			break;
		switch (c) {
		case 'h':
			help();
			return 0;
		case 'c':
			{
				int i;
				i = snd_card_get_index(optarg);
				if (i >= 0 && i < 32)
					sprintf(card, "hw:%i", i);
				else {
					fprintf(stderr, "Invalid card number.\n");
					morehelp++;
				}
			}
			break;
		case 'D':
			strncpy(card, optarg, sizeof(card)-1);
			card[sizeof(card)-1] = '\0';
			break;
		case 'q':
			quiet = 1;
			break;
		case 'i':
			level |= LEVEL_INACTIVE;
			break;
		case 'd':
			debugflag = 1;
			break;
		case 'n':
			no_check = 1;
			break;
		case 'v':
			printf("amixer version " SND_UTIL_VERSION_STR "\n");
			return 1;
		case 'a':
			smixer_level = 1;
			memset(&smixer_options, 0, sizeof(smixer_options));
			smixer_options.ver = 1;
			if (!strcmp(optarg, "none"))
				smixer_options.abstract = SND_MIXER_SABSTRACT_NONE;
			else if (!strcmp(optarg, "basic"))
				smixer_options.abstract = SND_MIXER_SABSTRACT_BASIC;
			else {
				fprintf(stderr, "Select correct abstraction level (none or basic)...\n");
				morehelp++;
			}
			break;
		case 's':
			read_stdin = 1;
			break;
		default:
			fprintf(stderr, "Invalid switch or option needs an argument.\n");
			morehelp++;
		}
	}
	if (morehelp) {
		help();
		return 1;
	}
	smixer_options.device = card;

	if (read_stdin)
		return exec_stdin();

	if (argc - optind <= 0) {
		return selems(LEVEL_BASIC | level) ? 1 : 0;
	}
	if (!strcmp(argv[optind], "help")) {
		return help() ? 1 : 0;
	} else if (!strcmp(argv[optind], "info")) {
		return info() ? 1 : 0;
	} else if (!strcmp(argv[optind], "controls")) {
		return controls(level) ? 1 : 0;
	} else if (!strcmp(argv[optind], "contents")) {
		return controls(LEVEL_BASIC | level) ? 1 : 0;
	} else if (!strcmp(argv[optind], "scontrols") || !strcmp(argv[optind], "simple")) {
		return selems(level) ? 1 : 0;
	} else if (!strcmp(argv[optind], "scontents")) {
		return selems(LEVEL_BASIC | level) ? 1 : 0;
	} else if (!strcmp(argv[optind], "sset") || !strcmp(argv[optind], "set")) {
		return sset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 0, 0) ? 1 : 0;
	} else if (!strcmp(argv[optind], "sget") || !strcmp(argv[optind], "get")) {
		return sset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 1, 0) ? 1 : 0;
	} else if (!strcmp(argv[optind], "cset")) {
		return cset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 0, 0) ? 1 : 0;
	} else if (!strcmp(argv[optind], "cget")) {
		return cset(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL, 1, 0) ? 1 : 0;
	} else if (!strcmp(argv[optind], "events")) {
		return events(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL);
	} else if (!strcmp(argv[optind], "sevents")) {
		return sevents(argc - optind - 1, argc - optind > 1 ? argv + optind + 1 : NULL);
	} else {
		fprintf(stderr, "amixer: Unknown command '%s'...\n", argv[optind]);
	}

	return 0;
}